Room simulation bug

[swarmjon]

I think I've found a bug in the room simulation utility. If there are 2 subwoofers in a room, and you set a mic position offset by some amount (I used 5 feet), there is a discrepancy between the offset mic position, and moving the main listening position to match. This discrepancy changes when you hover your mouse over the position to highlight the curve in the response window, which implies to me that the frequency response window isn't showing the full calculation till you hover the mouse over one of the positions to highlight a specific curve. For instance, take a room with 2 subs, one in each front corner. If I model the MLP, and a mic positioned 5' to the left, you get a response plot. Then if I move the MLP to match the position 5' to the left, the response matches, but if I then mouse over the MLP, the plot changes.

MLP + mic 5' left:

MLP moved to match the 5' left position (response matches the 5' left mic position from before):

Don't change MLP, but just hover over the MLP, and the response changes:

I don't see this behavior if there is only one sub being modeled, so it appears to be related to multiple sources.

This is using REW v5.4 Beta 110. I've found this behavior on both the Mac and Windows versions. Thoughts?

 

[John Mulcahy]

MLP moved to match the 5' left position

Moved how?

Moving the MLP with your settings changes the sub delays.

 

[swarmjon]

Ah. That's what it was. I didn't notice the time alignment changing. So I guess what I really discovered is that the time alignment doesn't update till you mouse over the MLP.

To test this, I saved two configurations, one with the MLP in the middle, and one with a mic positioned 5' left, then another with the MLP positioned 5' to the left- P4 and P5 in this instance. Loading one, then the other doesn't cause the time alignment to update till you mouse over the MLP. It seems that the act of mousing over the MLP is what causes the automatic time alignment to update.

Thanks for the quick response!

 

[John Mulcahy]

I'll fix "alignment delays not updating when a preset is loaded" in the next build.

 

[swarmjon]

Cool. Thanks.